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There's also a strategic issue. Carriers have had a longer service life than fighter aircraft types. Only two US carriers have been commissioned since the Super Hornet became operational.
It is as close to certain as we get in this business that there will be CATOBAR aircraft in service and under development through the life of the QEs, because that is a major US strategic capability.
There are few who would argue seriously that the Marine STOVL capability is at the same level of importance. The B came close to being chopped in 2010. Given its performance, likely operating costs and the budget environment, its survival is not a given.